I didn’t realize this until today, but Magento 2 has completely ripped out the class rewrite system, and replaced it with a new dependency injection system. You can still rewrite a class, but instead of setting up a rewrites node (as you would in earlier versions of Magento 2) you setup a <preferences/> node. According to the Application Framework wiki page, this node used to be named aliases .
magento2 – Magento 1 Class Rewrite in Magento 2 with Dependency Injection System – Magento Stack Exchange
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